Frog does not have?

A. Brain

B. Ribs

C. Heart

D. Lungs

Digestion food begins in?

A. Stomach

B. Mouth

C. Intestine

D. Liver

For purifying drinking water, Alum(Phitkari) is used?

A. To kill bacteria

B. To remove salt

C. For solidification of mud

D. To Remove Gases

Air is a?

A. Compound

B. Element

C. Mixture

D. Electrolyte

The ozone layer restricts?

A. Ultraviolet radiation.

The hardest substance available on Earth is?

A. Diamond.

Which of the following is used in pencils?

A. Silicon

B. Phosphorus

C. Graphite

D. None

Most common element on the Earth crust is?

A. Oxygen.

The biggest planet in Solar system is?

A. Jupiter.